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Thread: Need help with K31 Sporter made in Basel

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  1. #11
    Senior Member Pierre's Avatar
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    MrHumble, if I had that set up here I could most certainly solve it for you, but failing that, if you could remove the scope, leave the mount in place and sends me some close-up photographs of both sides and as much of the underside as you can manage, I might be able to find a solution for you. My machine shop has both fabrication and manufacturing capability, but we do not do one off jobs or projects. the best I could do is probably a simple illustration to send of something you can make yourself to solve the problem.

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  3. #12
    Contributing Member rcathey's Avatar
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    Quote Originally Posted by Pierre View Post
    the best I could do is probably a simple illustration to send of something you can make yourself to solve the problem.
    That’s mighty generous! Design work doesn’t come cheap in the manufacturing world. Good on you!

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  5. #13
    Member mr humble's Avatar
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    Here are the photos of the scope and mount. I'm thinking the rear mount is the problem.







  6. #14
    Member mr humble's Avatar
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    Since scope ie really whupped, gonna take off claw bases and put on Swissicon products base w/12X Leupold that works fine on my K31 w/no deflector. I've found the secret is to have a scope with a looong tube that allows rings to be far enough apart to avoid empties from hitting rings. Also no "focus" knob on the left side of the scope can be tolerated. Older Leupolds, Weavers, Lymans etc. fill the bill.


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    Member mr humble's Avatar
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    Well, the claw mounts appeared to be dovetailed and soldered (front) and screwed and soldered (rear) so removing them is not on my short list. On a happier note, my mil-spec K-31 loves the purpose built NOE plain base K-31 bullet. Cast of wheel weight with some added tin, unsized and powder coated, it dropped 5 in 1/2" @ 50 yds with 8.3 of TrailBoss.

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    Member mr humble's Avatar
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    Thread Starter

    Found another K31 sporter

    This one has a different mount with a Leupold scope. We'll see if it works !


  9. #17
    Member mr humble's Avatar
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    AH ha ! This new one has an overbore base BUT the bottom of the base has a 45 degree taper to deflect the empty. Never seen a mount like this before but it's very well made, rock solid and QD as well.

  10. #18
    Member mr humble's Avatar
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    no joy

    Ah ha, but it doesn't work either. Guess the drill ,when not shooting off bench, is to rotate the rifle 90 degrees so the port is down, then gravity will take over. At least it's overbore !

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    Really Senior Member Bruce_in_Oz's Avatar
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    One useful way to stop cases bashing into the windage drum is to rotate the whole scope 90 degrees to the left. Some "buffer" material attached to the tube and reticule housing will keep things "tidy'.

    This, of course, works better with "conventional" reticules like the classic "Duplex". Fancy reticules with ranging systems etc? Not so much. Maybe a nice scope maker or optical technician could rotate the fancy reticules.. $$$....

    Obvious, but now somewhat more expensive solution is to seek out a proper ZfK 55. If you have ever fired one, they are an object lesson in "getting results- Swissicon style". I was offered one about six or seven years ago but could not justify the expense at the time, even less so now. My trusty old K-11 will keep me amused for a few more years.

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    Member mr humble's Avatar
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    Rotating don't help

    The K31 ejects up and slightly to the left so there is no turret in the way. that's why the Swissicon prod mt is offset to the right. I sold the rifle w/the claw mounts.

    As for my mil-spec K31 ----- don't buy a bore scope ! Erosion and pitting 12" up from chamber.

    My rebore guy is willing to see if he can rethroat and rebore to 35 caliber, i.e. a .357x55.

    Easy to make ammo w/38 special carbide sizer and expander.


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